<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<!--
    checked    用来让表单有一个默认选中的状态

-->
<p>
    <input type="radio" name="sex" valusexsexe="man">男
    <input type="radio" name="sex" value="woman" checked="checked">女
</p>
<p>
    <input type="checkbox" name="interest" value="eat">吃饭
    <input type="checkbox" name="interest" value="sleep">睡觉
    <input type="checkbox" name="interest" value="play" checked="checked">打游戏
</p>
</body>
</html>